This example displays the ten most populous countries as horizontal bars of varying length, with no axes or labels. The chart uses React to manage state and render SVG rectangles, while D3’s `scaleBand` and `scaleLinear` position and size the bars based on population values. Data comes from the United Nations World Population Prospects 2019, loaded as CSV via `d3.csv` and filtered to the first ten rows. The visualization updates once the data is fetched, showing a simple loading message before the bars appear.